Holiday to Antigua & Barbuda Antigua & Barbuda Travels for Whitney and his partner, plantation manager Phineas Miller, tried in vain to recoup their losses in court. Yet, even if the cotton gin did not make Whitney’s personal fortune, it transformed the nation’s economy. By the 1850s, three-quarters of the world’s supply of cotton came from the American South. Whitney’s invention also affected the entrenchment of SLAVERY. Cotton production was well suited to the Southern plantation system. Slavery had been in decline by 1790, but the cotton boom prompted planters to import more slaves into the Southern states before the legal closure of the slave trade in 1808. The cotton gin further encouraged farmers to focus on a single cash crop and work the land until it was exhausted, then move to new land, a devastating agricultural practice. Holiday to Antigua & Barbuda Antigua & Barbuda Travels 2016.